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Defined Benefit Plan - Defined Benefit Plan (Details) - Defined Benefit Plans - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Components of net periodic benefit cost        
Service cost $ 0.7 $ 0.8 $ 1.4 $ 1.6
Interest cost 1.5 1.4 3.0 2.8
Expected return on plan assets (2.4) (2.6) (4.8) (5.2)
Amortization of unrecognized loss 0.8 1.2 1.7 2.3
Net periodic benefit cost 0.6 $ 0.8 1.3 1.5
Amortization of unrecognized loss, tax $ (0.2)   $ (0.4) $ (0.3)